{"id":65722,"date":"2026-10-14T10:20:05","date_gmt":"2026-10-14T04:50:05","guid":{"rendered":"https:\/\/www.quickonlinetips.com\/archives\/?page_id=65722"},"modified":"2026-10-14T14:31:47","modified_gmt":"2026-10-14T09:01:47","slug":"json-formatter","status":"publish","type":"page","link":"https:\/\/www.quickonlinetips.com\/archives\/tools\/json-formatter\/","title":{"rendered":"JSON Formatter and Validator: Beautify, Minify, Fix Errors"},"content":{"rendered":"<p>Paste JSON into this <strong>JSON formatter<\/strong> to make it readable in one click. 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.qt-cell:disabled{cursor:default} .qt-tool .qt-win{background:#C6F6D5;border-color:#38A169} .qt-tool .qt-sel{background:#BEE3F8;border-color:#3182CE} .qt-tool .qt-bad{background:#FED7D7;border-color:#E53E3E} .qt-tool select{-webkit-appearance:none;-moz-appearance:none;appearance:none;padding-right:40px;cursor:pointer;border:2px solid #90B4DA;font-weight:600;background-color:#fff;background-image:url(\"data:image\/svg+xml,%3Csvg xmlns='http:\/\/www.w3.org\/2000\/svg' viewBox='0 0 14 9'%3E%3Cpath d='M1.5 1.5l5.5 5.5 5.5-5.5' fill='none' stroke='%232B6CB0' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'\/%3E%3C\/svg%3E\");background-repeat:no-repeat;background-position:right 14px center;background-size:14px 9px} .qt-tool select:hover{border-color:var(--qt-accent);background-color:#F4F8FD} .qt-tool select::-ms-expand{display:none} .qt-next{margin:0 0 1.75em} .qt-next .qt-next-h{font-size:14px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:#4A5568;margin:0 0 8px} .qt-next-g{display:grid;grid-template-columns:repeat(3,1fr);gap:8px} .qt-next-g a{display:flex;align-items:center;min-height:46px;padding:9px 12px;border:1px solid #AEC3DB;border-radius:8px;background:#F4F8FD;color:#215387;font-weight:600;font-size:15px;line-height:1.3;text-decoration:none} .qt-next-g a:hover,.qt-next-g a:focus{background:#E3EEFF;border-color:#2B6CB0;text-decoration:none} @media (max-width:600px){.qt-next-g{grid-template-columns:repeat(2,1fr)}}<\/style>\n<div class=\"qt-tool\" id=\"qt-js\"><label class=\"qt-label\" for=\"qt-js-in\">JSON input<\/label><textarea id=\"qt-js-in\" rows=\"10\" spellcheck=\"false\" placeholder=\"Paste JSON here\"><\/textarea><\/p>\n<div class=\"qt-grid\">\n<div class=\"qt-field\"><label for=\"qt-js-ind\">Indent<\/label><select id=\"qt-js-ind\"><option value=\"2\" selected>2 spaces<\/option><option value=\"4\">4 spaces<\/option><option value=\"tab\">Tab<\/option><\/select><\/div>\n<\/div>\n<div class=\"qt-row\"><label class=\"qt-check\"><input type=\"checkbox\" id=\"qt-js-sort\"> Sort keys A-Z<\/label><\/div>\n<div class=\"qt-row\"><button type=\"button\" class=\"qt-btn qt-btn-big\" id=\"qt-js-fmt\">Format<\/button><button type=\"button\" class=\"qt-btn qt-btn-ghost\" id=\"qt-js-min\">Minify<\/button><button type=\"button\" class=\"qt-btn qt-btn-ghost\" id=\"qt-js-copy\">Copy result<\/button><button type=\"button\" class=\"qt-btn qt-btn-ghost\" id=\"qt-js-clear\">Clear<\/button><\/div>\n<div class=\"qt-status\" id=\"qt-js-status\" aria-live=\"polite\"><\/div>\n<p><label class=\"qt-label\" for=\"qt-js-out\" style=\"margin-top:10px\">Result<\/label><textarea id=\"qt-js-out\" class=\"qt-out\" rows=\"14\" readonly spellcheck=\"false\"><\/textarea><\/p>\n<p class=\"qt-note\">Everything runs in your browser. Nothing you enter is sent to or stored on our server.<\/p>\n<\/div>\n<p><script>(function () { function qtReady(fn) { if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', fn); } else { fn(); } } function qtCopy(text, statusEl, okMsg) { function done(ok) { if (statusEl) { statusEl.textContent = ok ? (okMsg || 'Copied to clipboard.') : 'Press Ctrl+C (or Cmd+C) to copy.'; } } function fallback() { var ta = document.createElement('textarea'); ta.value = text; ta.setAttribute('readonly', ''); ta.style.position = 'fixed'; ta.style.top = '-1000px'; document.body.appendChild(ta); ta.select(); var ok = false; try { ok = document.execCommand('copy'); } catch (e) { ok = false; } document.body.removeChild(ta); done(ok); } if (navigator.clipboard) { if (window.isSecureContext) { navigator.clipboard.writeText(text).then(function () { done(true); }, fallback); return; } } fallback(); } function qtRand32() { var c = window.crypto || window.msCrypto; if (c) { if (c.getRandomValues) { var a = new Uint32Array(1); c.getRandomValues(a); return a[0]; } } return Math.floor(Math.random() * 4294967296); } function qtRandInt(range) { if (range === 4294967296) { return qtRand32(); } var limit = Math.floor(4294967296 \/ range) * range; var x = qtRand32(); while (x >= limit) { x = qtRand32(); } return x % range; } qtReady(function () { var inp = document.getElementById('qt-js-in'); if (!inp) { return; } function $(id) { return document.getElementById(id); } var st = $('qt-js-status'), out = $('qt-js-out'); function sortKeys(v) { if (Array.isArray(v)) { return v.map(sortKeys); } if (v !== null) { if (typeof v === 'object') { var o = {}; Object.keys(v).sort().forEach(function (k) { o[k] = sortKeys(v[k]); }); return o; } } return v; } function where(text, e) { var m = \/line (\\d+) column (\\d+)\/.exec(e.message); if (m) { return [+m[1], +m[2]]; } m = \/position (\\d+)\/.exec(e.message); var pos = m ? +m[1] : -1; if (0 > pos) { var tests = [\/,\\s*[\\]}]\/, \/[:,\\[{]\\s*'\/, \/[{,]\\s*[A-Za-z_$][\\w$]*\\s*:\/, \/\\\/\\*|^\\s*\\\/\\x2f\/m, \/\\b(NaN|undefined|Infinity)\\b\/]; for (var i = 0; tests.length > i; i++) { var mm = tests[i].exec(text); if (mm) { if (0 > pos || pos > mm.index) { pos = mm.index; } } } } if (pos >= 0) { var before = text.slice(0, pos).split('\\n'); return [before.length, before[before.length - 1].length + 1]; } return null; } function parse() { var text = inp.value.replace(\/^\ufeff\/, ''); if (!text.trim()) { st.textContent = 'Paste some JSON first.'; st.classList.add('qt-error'); return undefined; } try { var v = JSON.parse(text); st.classList.remove('qt-error'); return { v: v }; } catch (e) { var w = where(text, e); var line = w ? text.split('\\n')[w[0] - 1] : ''; st.textContent = 'Invalid JSON' + (w ? ' at line ' + w[0] + ', column ' + w[1] : '') + ': ' + e.message.replace(\/^JSON\\.parse: \/, '') + (line ? '  \u2192  ' + line.trim().slice(0, 80) : '') + '. Common causes: a trailing comma, single quotes instead of double quotes, or a missing bracket.'; st.classList.add('qt-error'); if (w) { var lines = text.split('\\n'), off = 0; for (var i = 0; w[0] - 1 > i; i++) { off += lines[i].length + 1; } inp.focus(); inp.setSelectionRange(off + w[1] - 1, off + w[1]); } return undefined; } } function run(min) { var r = parse(); if (!r) { out.value = ''; return; } var v = $('qt-js-sort').checked ? sortKeys(r.v) : r.v; var ind = $('qt-js-ind').value; out.value = min ? JSON.stringify(v) : JSON.stringify(v, null, ind === 'tab' ? '\\t' : +ind); var kb = function (s) { return (new Blob([s]).size \/ 1024).toFixed(1) + ' KB'; }; st.textContent = 'Valid JSON. ' + (min ? 'Minified' : 'Formatted') + ': ' + kb(inp.value) + ' \u2192 ' + kb(out.value) + '.'; } $('qt-js-fmt').addEventListener('click', function () { run(false); }); $('qt-js-min').addEventListener('click', function () { run(true); }); $('qt-js-copy').addEventListener('click', function () { qtCopy(out.value, st, 'Result copied.'); }); $('qt-js-clear').addEventListener('click', function () { inp.value = ''; out.value = ''; st.textContent = ''; inp.focus(); }); $('qt-js-ind').addEventListener('change', function () { run(false); }); $('qt-js-sort').addEventListener('change', function () { run(false); }); if (!inp.value.trim()) { inp.value = JSON.stringify({ name: 'QuickOnlineTips', since: 2004, tools: ['word counter', 'json formatter'], active: true, owner: { name: 'Chandra', country: 'IN' } }); } run(false); }); })();<\/script><\/p>\n<div class=\"qt-next\">\n<p class=\"qt-next-h\">Try another free tool<\/p>\n<div class=\"qt-next-g\"><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/uuid-generator\/\">UUID Generator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/base64-encode-decode\/\">Base64 Encode and Decode<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/unix-timestamp-converter\/\">Unix Timestamp Converter<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/url-encode-decode\/\">URL Encode and Decode<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/password-generator\/\">Password Generator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/html-entities\/\">HTML Encode and Decode<\/a><\/div>\n<\/div>\n<p><strong>Quick answer:<\/strong> Paste your JSON and click <strong>Format<\/strong>. Valid JSON is shown neatly indented below; invalid JSON gets an error message with the line and column, and the cursor jumps to the problem.<\/p>\n<h2>How to use the JSON formatter<\/h2>\n<ol>\n<li>Paste JSON from an API response, a config file or a log into the input box.<\/li>\n<li>Choose 2 spaces, 4 spaces or tabs for indentation, and tick <strong>Sort keys A-Z<\/strong> to compare two objects more easily.<\/li>\n<li>Click <strong>Format<\/strong> to beautify or <strong>Minify<\/strong> to remove all spaces and line breaks.<\/li>\n<li>Click <strong>Copy result<\/strong>.<\/li>\n<\/ol>\n<h2>JSON validator: common errors and fixes<\/h2>\n<table class=\"qt-ref\">\n<thead>\n<tr>\n<th>Error<\/th>\n<th>Fix<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Trailing comma: <code>{\"a\":1,}<\/code><\/td>\n<td>Remove the comma after the last item.<\/td>\n<\/tr>\n<tr>\n<td>Single quotes: <code>{'a':1}<\/code><\/td>\n<td>JSON only allows double quotes for keys and strings.<\/td>\n<\/tr>\n<tr>\n<td>Unquoted keys: <code>{a:1}<\/code><\/td>\n<td>Put every key in double quotes: <code>{\"a\":1}<\/code>.<\/td>\n<\/tr>\n<tr>\n<td>Comments: <code>\/\/ note<\/code><\/td>\n<td>Standard JSON has no comments. Remove them (JSONC and JSON5 allow them, JSON.parse doesn&#8217;t).<\/td>\n<\/tr>\n<tr>\n<td>Special values: <code>NaN<\/code>, <code>undefined<\/code><\/td>\n<td>Use <code>null<\/code> or a string instead.<\/td>\n<\/tr>\n<tr>\n<td>Missing bracket or brace<\/td>\n<td>Every <code>[<\/code> and <code>{<\/code> needs a matching closing one. Format a smaller piece to find it.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>What is JSON?<\/h2>\n<p>JSON (JavaScript Object Notation) is the most common format for sending data between apps and servers. It has objects in curly braces, arrays in square brackets, and values that are strings, numbers, true, false or null. Its rules are defined in RFC 8259. Because JSON is plain text, a missing comma or quote breaks the whole file, which is why a validator is useful.<\/p>\n<h2>Format JSON on the command line and in editors<\/h2>\n<ul>\n<li><strong>jq:<\/strong> <code>jq . file.json<\/code> formats; <code>jq -c .<\/code> minifies.<\/li>\n<li><strong>Python:<\/strong> <code>python -m json.tool file.json<\/code><\/li>\n<li><strong>VS Code:<\/strong> Shift+Alt+F (Windows) or Shift+Option+F (Mac) in a .json file.<\/li>\n<li><strong>Chrome and Firefox:<\/strong> opening a JSON URL shows a formatted viewer.<\/li>\n<\/ul>\n<h2>Privacy<\/h2>\n<p>JSON often contains API keys, tokens and personal data. This formatter runs entirely in your browser with the built-in <code>JSON.parse<\/code>, so nothing is uploaded. Still, remove secrets before sharing formatted output with anyone.<\/p>\n<p>Need to decode a Base64 field inside your JSON? Use the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/base64-encode-decode\/\">Base64 decoder<\/a>. To compare two JSON files, format both with sorted keys and paste them into our <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/diff-checker\/\">diff checker<\/a>.<\/p>\n<h2>FAQ<\/h2>\n<h3>Is there a size limit?<\/h3>\n<p>Files of several megabytes work. Very large files depend on your device&#8217;s memory.<\/p>\n<h3>Does minifying change my data?<\/h3>\n<p>No. It only removes spaces and line breaks outside strings.<\/p>\n<h2>More free tools<\/h2>\n<div class=\"qt-cards\"><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/uuid-generator\/\"><strong>UUID Generator<\/strong><span>Generate random v4 UUIDs and GUIDs in bulk.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/base64-encode-decode\/\"><strong>Base64 Encode and Decode<\/strong><span>Encode text to Base64 and decode it back, UTF-8 safe.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/unix-timestamp-converter\/\"><strong>Unix Timestamp Converter<\/strong><span>Convert epoch time to a date and a date to epoch.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/url-encode-decode\/\"><strong>URL Encode and Decode<\/strong><span>Percent-encode or decode URLs and see query parameters.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/password-generator\/\"><strong>Password Generator<\/strong><span>Strong random passwords and passphrases with a strength meter.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/html-entities\/\"><strong>HTML Encode and Decode<\/strong><span>Convert special characters to HTML entities and back.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/hash-generator\/\"><strong>Hash Generator<\/strong><span>MD5, SHA-1 and SHA-256 hashes of any text.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/regex-tester\/\"><strong>Regex Tester<\/strong><span>Test regular expressions with live highlighting.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/css-minifier\/\"><strong>CSS Minifier<\/strong><span>Minify or beautify CSS and see the savings.<\/span><\/a><\/div>\n<p>See all of them on the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/\">QuickOnlineTips free online tools<\/a> page and play our <a href=\"https:\/\/www.quickonlinetips.com\/archives\/games\/\">free online games<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Paste JSON into this JSON formatter to make it readable in one click. It indents and lines up nested objects, can minify JSON for production, sort keys alphabetically, and acts as a JSON validator that points to the exact line and column of any syntax error. JSON input Indent2 spaces4 spacesTab Sort keys A-Z FormatMinifyCopy&#8230;<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":65595,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-65722","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65722","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/comments?post=65722"}],"version-history":[{"count":3,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65722\/revisions"}],"predecessor-version":[{"id":66484,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65722\/revisions\/66484"}],"up":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65595"}],"wp:attachment":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/media?parent=65722"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}